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Basically "O"n mean O scale (1/48) n for narrow gauge and the number is the width of the track.  30 stands for 30" but 3 stands for 3' hence Model Railroader using On2.5 for referencing 30" gaugeHOn3 is (1/87) HO narrow gauge 3' track width.  Buildings for On3 and On30 will work on O scale standard gauge since 1/4" equals one foot across the board.  On30 uses HO standard gauge track basically.  Clear as mud huh!

 

Greg

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